Atoms and Molecules Test

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Atoms and Molecules Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The molecular mass of H₂SO₄ is

A
100 g mol⁻¹

B
98 g mol⁻¹

C
49 g mol⁻¹

D
24 g mol⁻¹

Solution

Molecular mass of H₂SO₄= (2 × atomic mass of Hydrogen) + atomic mass of Sulfur + (4 × atomic mass of Oxygen) = (2 × 1) + 32 + (4 × 16) = 98 g mol⁻¹.

The correct answer is B.
Question 2
1 / -0

The formula of the compound formed by the combination of Cr³⁺ and F⁻ ions is

A
CrF

B
Cr₃F

C
CrF₃

D
Cr₃F₃

Solution

The balancing of an ionic compound is done in such a manner that there is no charge on the molecule as a whole. Thus, one Cr³⁺ will combine with three F⁻to form CrF_3.

Hence, the correct answer is option C.
Question 3
1 / -0

A symbol is an abbreviated way to represent the name of an element. Which symbol represents the element chlorine?

A
Cu

B
Cl

C
Ca

D
Cd

Solution

Cl is the symbolic representation of the element chlorine.

The correct answer is B.

Why alternative A is wrong:

Cu is the symbol for copper.

Why alternative C is wrong:

Ca is the symbol for calcium.

Why alternative D is wrong:

Cd is the symbol for cadmium.
Question 4
1 / -0

Which element is represented by the symbol Ag?

A
Gold

B
Silver

C
Argon

D
Copper

Solution

The symbol of silver has been derived from its Latin name Argentum. Hence, silver is represented by the symbol Ag.

The correct answer is B.

Why alternative A is wrong:

Gold is represented by the symbol Au.

Why alternative C is wrong:

Argon is represented by the symbol Ar.

Why alternative D is wrong:

Copper is represented by the symbol Cu.
Question 5
1 / -0

Which element is represented by the chemical symbol W?

A
Tin

B
Silver

C
Mercury

D
Tungsten

Solution

W is the chemical symbol used for the element tungsten.

The correct answer is D.

Why alternative A is wrong:

Tin is represented by the chemical symbol Sn.

Why alternative B is wrong:

Silver is represented by the chemical symbol Ag.

Why alternative C is wrong:

Mercury is represented by the chemical symbol Hg.

Question 6

1 / -0

Use the following information to answer the next question.

The chemical formula of a molecular compound gives the information about the constituent elements of a compound. It also indicates the number of atoms of each element present in one molecule of that compound.

Each molecule of sulfuric acid has

one oxygen and four sulfur atoms

one sulfur and four hydrogen atoms

one sulfur, two hydrogen, and four oxygen atoms

one sulfur, two oxygen, and four hydrogen atoms

Solution

The molecular formula of sulfuric acid is H₂SO₄. From the molecular formula of sulfuric acid, it can be inferred that the elements present in sulfuric acid are hydrogen, sulfur, and oxygen and that the number of hydrogen, sulfur, and oxygen atoms in the molecule are 2, 1, and 4 respectively.

The correct answer is C.

Question 7
1 / -0

What are the respective numbers of carbon, hydrogen, and oxygen atoms in a molecule of glucose?

A
6, 6, and 6

B
6, 12, and 6

C
12, 6, and 12

D
12, 12, and 12

Solution

The chemical formula of glucose is C₆H₁₂O₆. The formula of glucose shows that a molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

The correct answer is B.
Question 8
1 / -0

The amount of a substance can be expressed by the number of particles in a sample. What is the S.I. unit to measure of the amount of substance?

A
Mole

B
Joule

C
Pascal

D
Kelvin

Solution

The S.I unit for the measure of the amount of substance is mole. Mole is defined as the number of atoms present in 0.012 kg of carbon − 12.

The correct answer is A.

Why alternative B is wrong:

Joule is the S.I unit of energy.

Why alternative C is wrong:

Pascal is the S.I unit of pressure.

Why alternative D is wrong:

Kelvin is the S.I unit of temperature.

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Re-Attempt Weekly Quiz Competition

Atoms and Molecules Test - 13

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Atoms and Molecules Test - 13

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Question 1

100 g mol−1

98 g mol−1

49 g mol−1

24 g mol−1

Solution

Question 2

CrF

Cr3F

CrF3

Cr3F3

Solution

Question 3

Cu

Cl

Ca

Cd

Solution

Question 4

Gold

Silver

Argon

Copper

Solution

Question 5

Tin

Silver

Mercury

Tungsten

Solution

Question 6

one oxygen and four sulfur atoms

one sulfur and four hydrogen atoms

one sulfur, two hydrogen, and four oxygen atoms

one sulfur, two oxygen, and four hydrogen atoms

Solution

Question 7

6, 6, and 6

6, 12, and 6

12, 6, and 12

12, 12, and 12

Solution

Question 8

Mole

Joule

Pascal

Kelvin

Solution

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100 g mol⁻¹

98 g mol⁻¹

49 g mol⁻¹

24 g mol⁻¹

Cr₃F

CrF₃

Cr₃F₃